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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b101bfafa39d0031b103fafc3b18f282371252040e285b1a8caa5773e4c18de5' 
  AND token = 'b2eES6AB29uVUxuPWQF5YwH5pOm1eOqiikk+tnvIzQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}